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If #(a,b,c,d)means you subtract the sum of the terms from zero, and # (4,-8,11,d)=14, then d=

answer and explain

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    #(a,b,c,d) = 0-(a+b+c+d)

    0-(4+(-8)+11+d) = 14
    -(d+7) = 14
    d+7 = -14
    d = -21

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